Packages

pacman::p_load(dplyr, ggplot2, readr, haven, broom, purrr, tidyr, magrittr, labelled, sjPlot, viridis, forcats, ggthemes, cluster, factoextra, fpc)

Data

ches <- get(load("data/Rdata/ches_final.Rdata"))

Indeces

range01 <- function(x){(x - min(x, na.rm = T)) / (max(x, na.rm = T) - min(x, na.rm = T))}
ches <- ches %>% 
  mutate(populism = antielite_salience + corrupt_salience) %>% 
  mutate(populism2 = range01(range01(antielite_salience) + 
                               (1 - range01(eu_position)))*100) %>% #+ 
                           #    (1 - range01(eu_budgets)))*100) %>% 
  mutate(liberalism = sociallifestyle + civlib_laworder + galtan) %>% 
  mutate(populism = range01(populism)*100) %>% 
  mutate(liberalism = range01(liberalism)*100) #%>% 
  #filter(year > 2009)

Horse-shoe

ches %>% 
  ggplot(aes(liberalism, populism, colour = eu_position)) + 
  geom_point() +
  geom_smooth(method = "lm", formula = y ~ poly(x, 2))+
  #geom_text_repel(aes(liberalism, populism, label = party_cntry)) +
  ggthemes::theme_hc() +
  viridis::scale_color_viridis()

Clustering

set.seed(2018)
ches_cluster_data <- ches %>% 
  select(party_name, vote_id, liberalism, populism2) %>% 
  drop_na(liberalism, populism2) %>% 
  as.data.frame()
ches_cluster <- ches_cluster_data %>% 
  select(-party_name, -vote_id) %>% 
  purrr::map_df(scale) 
distance <- get_dist(ches_cluster)
fviz_dist(distance, 
 gradient = list(low = "#00AFBB", 
                 mid = "white",
                 high = "#FC4E07"))

kmeans() function returns a list of components, including:

  • cluster: A vector of integers (from 1:k) indicating the cluster to which each point is allocated
  • centers: A matrix of cluster centers (clustqer means)
  • totss: The total sum of squares (TSS), i.e (xi ≠ x ̄)2. TSS measures the total variance in the data.
  • withinss: Vector of within-cluster sum of squares, one component per cluster
  • tot.withinss: Total within-cluster sum of squares, i.e. sum(withinss)
  • betweenss: The between-cluster sum of squares, i.e. totss ≠ tot.withinss
  • size: The number of observations in each cluster
k3 <- kmeans(ches_cluster, centers = 3, nstart = 25, iter.max = 10)
ggf <- fviz_cluster(k3, data = ches_cluster, show.clust.cent = T, text = "vote_id")
ggf + theme_gdocs()

fviz_cluster(
  k3, 
  data = ches_cluster,
  palette = c("#2E9FDF", "#00AFBB", "#E7B800"), 
  ellipse.type = "euclid", # Concentration ellipse star.plot = TRUE, # Add segments from centroids to items repel = TRUE, # Avoid label overplotting (slow)
  ggtheme = theme_minimal()
)

# Elbow method
fviz_nbclust(ches_cluster, kmeans, method = "wss") +
  geom_vline(xintercept = 4, linetype = 2) +
  labs(subtitle = "Elbow method") + 
  theme_gdocs()

# Silhouette method
fviz_nbclust(ches_cluster, kmeans, method = "silhouette") +
  labs(subtitle = "Silhouette method") +
  theme_gdocs()

# Gap statistic
# nboot = 50 to keep the function speedy.
# recommended value: nboot= 500 for your analysis.
# Use verbose = FALSE to hide computing progression.
fviz_nbclust(ches_cluster, kmeans, nstart = 25, method = "gap_stat", nboot = 50) + 
  labs(subtitle = "Gap statistic method") +
  theme_gdocs()
Clustering k = 1,2,..., K.max (= 10): .. done
Bootstrapping, b = 1,2,..., B (= 50)  [one "." per sample]:
.................................................. 50 

According to these observations, it’s possible to define k = 4 as the optimal number of clusters in the data.

2 dimensions do not need pca

library(purrr)
res <- purrr::map(2:8, ~ kmeans(ches_cluster, .))
library(ggfortify)
autoplot(res, data = ches_cluster, ncol = 3) + theme(legend.position = "none")

normal scatterplots

k_cluster_dat <- 2:8 %>%
  purrr::map(~ kmeans(ches_cluster, .x)$cluster) %>%
  reduce(cbind) %>%
  as_tibble() %>%
  set_names(paste0("k", 2:8)) %>%
  cbind(ches_cluster, .)
k_cluster_dat %>%
  gather("k", "value", -liberalism, -populism2) %>%
  ggplot(aes(liberalism, populism2, colour = as.factor(value))) +
  geom_point() +
  facet_wrap(~k) +
  scale_colour_viridis(discrete = T, direction = -1) + 
  theme_hc() +
  theme(legend.position = "none")

cbind(ches_cluster, cluster = k3$cluster) %>%
  group_by(cluster) %>%
  summarise_all(.funs = list(m = mean, s = sd))

K-Medoids

The most common k-medoids clustering methods is the PAM algorithm (Partitioning Around Medoids, Kaufman & Rousseeuw, 1990).

res_pam <- pam(ches_cluster, 3, metric = "euclidean", stand = FALSE)
res_pam$clustering
  [1] 1 1 1 1 2 2 2 2 2 1 3 1 3 2 1 2 1 2 1 3 1 1 2 2 2 1 1 2 3 3 1 1 2 2 1 3 3
 [38] 3 1 1 3 1 2 1 2 2 2 1 1 2 1 1 1 1 1 1 1 1 1 2 3 3 2 2 2 2 1 1 2 2 2 1 1 1
 [75] 1 1 3 2 3 2 1 1 2 3 3 2 2 2 2 1 2 1 1 3 1 2 3 1 1 2 1 1 1 1 1 3 1 2 2 2 1
[112] 3 2 2 3 1 1 3 3 1 2 2 1 3 1 1 2 1 1 1 2 2 2 1 3 1 1 2 2 2 3 3 2 2 1 3 3 2
[149] 2 2 3 2 1 2 1 3 3 2 2 2 1 1 1 2 3 3 1 1 1 3 2 2 3 2 3 3 2 2 2 3 3 2 1 3 1
[186] 2 3 2 1 3 3 3 2 2 2 2 2 2 3 2 2 2 2 2 2 3 1 2 3 3 2 2 1 2 2 2 2 1 1 1 2 1
[223] 2 1 1 1 3 3 1 3 1 3 1 3 1 2 3 2 1 3 3 1 1 3 1 2 2 1 1 2 3 3 2 2 1 2 2 1 1
[260] 1 3 1 2 2 1 2 1 1
fviz_nbclust(ches_cluster, pam, method = "silhouette")+
theme_hc()

km_cluster_dat <- 2:8 %>%
  purrr::map(~ pam(ches_cluster, k = ., metric = "euclidean", stand = FALSE)$clustering) %>%
  reduce(cbind) %>%
  as_tibble() %>%
  set_names(paste0("k", 2:8)) %>%
  cbind(ches_cluster, .)
gg_km <- km_cluster_dat %>%
  gather("k", "value", -liberalism, -populism2) %>%
  ggplot(aes(liberalism, populism2, colour = as.factor(value))) +
  geom_point() +
  facet_wrap(~k) +
  scale_colour_viridis(discrete = T, direction = -1) + 
  theme_hc() +
  theme(legend.position = "none")
gg_km

res_pam$medoids
     liberalism  populism2
[1,] -0.9858867 -0.2065320
[2,]  0.2614908 -0.7920694
[3,]  1.3112089  1.2857607
cbind(ches_cluster, cluster = res_pam$clustering) %>%
  group_by(cluster) %>%
  summarise_all(.funs = list(m = median))
fviz_nbclust(ches_cluster, clara, method = "silhouette")+
theme_classic()

HCA

res.dist <- dist(ches_cluster, method = "euclidean")
res.hc <- hclust(d = res.dist, method = "ward.D2")
fviz_dend(res.hc, cex = 0.5)

# Cut tree into 3 groups
grp <- cutree(res.hc, k = 3)
fviz_dend(
  res.hc, 
  k = 3, # Cut in four groups
  cex = 0.5, # label size
  k_colors = c("#2E9FDF", "#00AFBB", "#E7B800"),
  color_labels_by_k = TRUE, # color labels by groups
  rect = TRUE # Add rectangle around groups
)

fviz_dend(
  res.hc, 
  cex = 1, 
  k = 3,
  k_colors = "jco", 
  type = "circular"
)
require("igraph")
Lade nötiges Paket: igraph

Attache Paket: ‘igraph’

The following object is masked from ‘package:clValid’:

    clusters

The following object is masked from ‘package:tidyr’:

    crossing

The following objects are masked from ‘package:purrr’:

    compose, simplify

The following objects are masked from ‘package:dplyr’:

    as_data_frame, groups, union

The following objects are masked from ‘package:stats’:

    decompose, spectrum

The following object is masked from ‘package:base’:

    union
ggrep <- fviz_dend(res.hc, k = 3, k_colors = "jco",
          type = "phylogenic", repel = TRUE)
ggrep

fviz_dend(res.hc, k = 3, # Cut in four groups
          k_colors = "jco",
          type = "phylogenic", 
          repel = TRUE,
          phylo_layout = "layout_with_drl")

fviz_dend(res.hc, k = 3, # Cut in four groups
          k_colors = "jco",
          type = "phylogenic", 
          repel = TRUE,
          phylo_layout = "layout_as_tree")

fviz_dend(res.hc, k = 3, # Cut in four groups
          k_colors = "jco",
          type = "phylogenic", 
          repel = TRUE,
          phylo_layout = "layout.gem")

fviz_dend(res.hc, k = 3, # Cut in four groups
          k_colors = "jco",
          type = "phylogenic", 
          repel = TRUE,
          phylo_layout = "layout.mds")

gg10 <- fviz_dend(res.hc, k = 3, # Cut in four groups
          k_colors = "jco",
          type = "phylogenic", 
          repel = TRUE,
          phylo_layout = "layout_with_lgl")
gg10

Compare clustering algorithms in R

library(clValid)
# Iris data set:
# - Remove Species column and scale df <- scale(iris[, -5])
# Compute clValid
clmethods <- c("hierarchical","kmeans","pam") 
intern <- clValid(
  ches_cluster %>% as.matrix, 
  nClust = 2:8,
  clMethods = clmethods, 
  validation = "internal"
) 
rownames for data not specified, using 1:nrow(data)
summary(intern)

Clustering Methods:
 hierarchical kmeans pam 

Cluster sizes:
 2 3 4 5 6 7 8 

Validation Measures:
                                 2       3       4       5       6       7       8
                                                                                  
hierarchical Connectivity  10.2683 17.5187 24.7937 35.0802 42.4873 45.0024 54.0444
             Dunn           0.0489  0.0569  0.0586  0.0678  0.0830  0.0886  0.0939
             Silhouette     0.4421  0.3938  0.4172  0.3977  0.3853  0.3710  0.3428
kmeans       Connectivity  27.6107 28.8794 42.6972 48.6603 59.4067 59.1024 80.4679
             Dunn           0.0336  0.0253  0.0327  0.0478  0.0201  0.0357  0.0419
             Silhouette     0.4495  0.4394  0.4634  0.4296  0.3995  0.4060  0.3596
pam          Connectivity  26.5952 39.1357 39.8861 38.1683 67.1135 73.0849 78.7849
             Dunn           0.0357  0.0331  0.0306  0.0334  0.0264  0.0243  0.0254
             Silhouette     0.4486  0.4179  0.4614  0.4267  0.4014  0.4006  0.3771

Optimal Scores:

             Score   Method       Clusters
Connectivity 10.2683 hierarchical 2       
Dunn          0.0939 hierarchical 8       
Silhouette    0.4634 kmeans       4       
# Stability measures
clmethods <- c("hierarchical","kmeans","pam")
stab <- clValid(
  ches_cluster %>% as.matrix,
  nClust = 2:6, 
  clMethods = clmethods,
  validation = "stability"
) # Display only optimal Scores
optimalScores(stab)

Model-Based Clustering

The model parameters can be estimated using the Expectation-Maximization (EM) algorithm initialized by hierarchical model-based clustering. Each cluster k is centered at the means μk, with increased density for points near the mean.

library(mclust)
mc <- Mclust(ches_cluster) # Model-based-clustering 
fitting ...

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summary(mc)
----------------------------------------------------
Gaussian finite mixture model fitted by EM algorithm 
----------------------------------------------------

Mclust EII (spherical, equal volume) model with 4 components:

 log.likelihood   n df       BIC       ICL
      -655.0623 268 12 -1377.216 -1431.308

Clustering table:
 1  2  3  4 
91 88 53 36 
# BIC values used for choosing the number of clusters 
fviz_mclust(mc, "BIC", palette = "jco")

# Classification: plot showing the clustering 
fviz_mclust(mc, "classification", geom = "point",
pointsize = 1.5, palette = "jco") # Classification uncertainty

fviz_mclust(mc, "uncertainty", palette = "jco")

ches %>% 
  ggplot(aes(liberalism, populism, colour = mc$classification)) + 
  geom_point() +
  #geom_smooth(method = "lm", formula = y ~ poly(x, 2))+
  #geom_text_repel(aes(liberalism, populism, label = party_cntry)) +
  ggthemes::theme_hc() +
  viridis::scale_color_viridis() + 
  geom_density2d(alpha = .7, color = "gray") # Add 2D density 

library(highcharter)

df1 <- tibble(vote = paste(ches_cluster_data$party_name, ches_cluster_data$vote_id, sep = " "), cluster = k3$cluster, x = as.vector(ches_cluster$liberalism), y = as.vector(ches_cluster$populism2)) %>%
  filter(stringr::str_detect(vote, "DE_"))
hchart(df1, hcaes(x = x, y = y, name = vote, color = cluster), type = 'scatter') %>%
  hc_add_theme(hc_theme_smpl()) %>%
  hc_tooltip(
    formatter = JS("function(){
                    return ('Party: <strong>' + this.point.vote + '</strong><br> X: ' + this.x + ' <br> Y: ' + this.y + ' <br>')
                  }")) %>%
  hc_chart(zoomType = "xy")

World Map

ggmap
Warnung in gzfile(file, "wb")
  kann komprimierte Datei '/Users/simonroth/Dropbox/projects/pol_efficacy/.Rproj.user/shared/notebooks/CDBFB3FD-A2_ches_clustering/1/473BEA9DF7ECD836/c78nbmwozwwyp_t/524d23442b1d4dbeae748ccb41943d92.snapshot' nicht öffnen. Grund evtl. 'No such file or directory'
Fehler in gzfile(file, "wb") : kann Verbindung nicht öffnen
Fehler in (function (which = dev.cur())  : 
  QuartzBitmap_Output - unable to open file '/Users/simonroth/Dropbox/projects/pol_efficacy/.Rproj.user/shared/notebooks/CDBFB3FD-A2_ches_clustering/1/473BEA9DF7ECD836/c78nbmwozwwyp_t/_rs_chunk_plot_001.png'
#ess_clean <- ess_sub  %>% 
  # mutate(eu_member =
  #          recode_factor(cntry,
  #               DE = 1958, BE = 1958, FR = 1958, NL = 1958, IE = 1973,
  #               GB = 1973, FI = 1995, AT = 1995, SE = 1995, EE = 2004,
  #               PL = 2004, SI = 2004, CZ = 2004, CH = 0, IL = 0,
  #               IS = 0, NO = 0, RU = 0
  #             )
  #       ) %>%
  # mutate(post_com = ifelse(region %in% c("Estonia", "Poland", "Slovenia", "Czech Republic", "Russian Federation"), "Post C", "West"))

Get Info

  • horse shoe theory
  • Set up Rmarkdown paper template
  • Set up Project page
p5 <- step5 %>%
  select(gndr, edu, income, rel, year) %>%
  gather("var", "value") %>%
  ggplot(aes(value, fill = var)) +
  geom_bar() +
  facet_wrap(~var, scales = "free") +
  viridis::scale_fill_viridis(discrete = T)
p5
---
title: "CHES Clustering"
subtitle: "Clsutering and Factor Scores"
author: "Rebecca & Simon "
output: html_notebook
---

## Packages

```{r}
pacman::p_load(dplyr, ggplot2, readr, haven, broom, purrr, tidyr, magrittr, labelled, sjPlot, viridis, forcats, ggthemes, cluster, factoextra, fpc)
```

## Data

```{r}
ches <- get(load("data/Rdata/ches_final.Rdata"))
```


## Indeces 

```{r}
range01 <- function(x){(x - min(x, na.rm = T)) / (max(x, na.rm = T) - min(x, na.rm = T))}
ches <- ches %>% 
  mutate(populism = antielite_salience + corrupt_salience) %>% 
  mutate(populism2 = range01(range01(antielite_salience) + 
                               (1 - range01(eu_position)))*100) %>% #+ 
                           #    (1 - range01(eu_budgets)))*100) %>% 
  mutate(liberalism = sociallifestyle + civlib_laworder + galtan) %>% 
  mutate(populism = range01(populism)*100) %>% 
  mutate(liberalism = range01(liberalism)*100) #%>% 
  #filter(year > 2009)
```

# Horse-shoe

```{r}
ches %>% 
  ggplot(aes(liberalism, populism, colour = eu_position)) + 
  geom_point() +
  geom_smooth(method = "lm", formula = y ~ poly(x, 2))+
  #geom_text_repel(aes(liberalism, populism, label = party_cntry)) +
  ggthemes::theme_hc() +
  viridis::scale_color_viridis()
```



## Clustering

```{r}
set.seed(2018)
ches_cluster_data <- ches %>% 
  select(party_name, vote_id, liberalism, populism2) %>% 
  drop_na(liberalism, populism2) %>% 
  as.data.frame()

ches_cluster <- ches_cluster_data %>% 
  select(-party_name, -vote_id) %>% 
  purrr::map_df(scale) 
```

```{r}
distance <- get_dist(ches_cluster)
fviz_dist(distance, 
 gradient = list(low = "#00AFBB", 
                 mid = "white",
                 high = "#FC4E07"))
```

`kmeans()` function returns a list of components, including:

* `cluster`: A vector of integers (from 1:k) indicating the cluster to which each point is allocated
* `centers`: A matrix of cluster centers (clustqer means)
* `totss`: The total sum of squares (TSS), i.e (xi ≠ x ̄)2. TSS measures the total variance in the data.
* `withinss`: Vector of within-cluster sum of squares, one component per cluster
* `tot.withinss`: Total within-cluster sum of squares, i.e. sum(withinss)
* `betweenss`: The between-cluster sum of squares, i.e. totss ≠ tot.withinss
* `size`: The number of observations in each cluster

```{r}
k3 <- kmeans(ches_cluster, centers = 3, nstart = 25, iter.max = 10)
ggf <- fviz_cluster(k3, data = ches_cluster, show.clust.cent = T, text = "vote_id")
ggf + theme_gdocs()
```


```{r}
fviz_cluster(
  k3, 
  data = ches_cluster,
  palette = c("#2E9FDF", "#00AFBB", "#E7B800"), 
  ellipse.type = "euclid", # Concentration ellipse star.plot = TRUE, # Add segments from centroids to items repel = TRUE, # Avoid label overplotting (slow)
  ggtheme = theme_minimal()
)
```



```{r}
# Elbow method
fviz_nbclust(ches_cluster, kmeans, method = "wss") +
  geom_vline(xintercept = 4, linetype = 2) +
  labs(subtitle = "Elbow method") + 
  theme_gdocs()


# Silhouette method
fviz_nbclust(ches_cluster, kmeans, method = "silhouette") +
  labs(subtitle = "Silhouette method") +
  theme_gdocs()

# Gap statistic
# nboot = 50 to keep the function speedy.
# recommended value: nboot= 500 for your analysis.
# Use verbose = FALSE to hide computing progression.
fviz_nbclust(ches_cluster, kmeans, nstart = 25, method = "gap_stat", nboot = 50) + 
  labs(subtitle = "Gap statistic method") +
  theme_gdocs()
```

According to these observations, it’s possible to define k = 4 as the optimal number of clusters in the data.


2 dimensions do not need pca

```{r, eval = F}
library(purrr)
res <- purrr::map(2:8, ~ kmeans(ches_cluster, .))
library(ggfortify)
autoplot(res, data = ches_cluster, ncol = 3) + theme(legend.position = "none")
```

normal scatterplots

```{r}
k_cluster_dat <- 2:8 %>%
  purrr::map(~ kmeans(ches_cluster, .x)$cluster) %>%
  reduce(cbind) %>%
  as_tibble() %>%
  set_names(paste0("k", 2:8)) %>%
  cbind(ches_cluster, .)

k_cluster_dat %>%
  gather("k", "value", -liberalism, -populism2) %>%
  ggplot(aes(liberalism, populism2, colour = as.factor(value))) +
  geom_point() +
  facet_wrap(~k) +
  scale_colour_viridis(discrete = T, direction = -1) + 
  theme_hc() +
  theme(legend.position = "none")
```



```{r}
cbind(ches_cluster, cluster = k3$cluster) %>%
  group_by(cluster) %>%
  summarise_all(.funs = list(m = mean, s = sd))
```


## K-Medoids

The most common k-medoids clustering methods is the PAM algorithm (Partitioning Around Medoids, Kaufman & Rousseeuw, 1990).

```{r}
res_pam <- pam(ches_cluster, 3, metric = "euclidean", stand = FALSE)
res_pam$clustering

fviz_nbclust(ches_cluster, pam, method = "silhouette")+
theme_hc()
```

```{r}
km_cluster_dat <- 2:8 %>%
  purrr::map(~ pam(ches_cluster, k = ., metric = "euclidean", stand = FALSE)$clustering) %>%
  reduce(cbind) %>%
  as_tibble() %>%
  set_names(paste0("k", 2:8)) %>%
  cbind(ches_cluster, .)

gg_km <- km_cluster_dat %>%
  gather("k", "value", -liberalism, -populism2) %>%
  ggplot(aes(liberalism, populism2, colour = as.factor(value))) +
  geom_point() +
  facet_wrap(~k) +
  scale_colour_viridis(discrete = T, direction = -1) + 
  theme_hc() +
  theme(legend.position = "none")
gg_km
```

```{r}
res_pam$medoids
```

```{r}
cbind(ches_cluster, cluster = res_pam$clustering) %>%
  group_by(cluster) %>%
  summarise_all(.funs = list(m = median))
```

```{r}
fviz_nbclust(ches_cluster, clara, method = "silhouette")+
theme_classic()
```

# HCA

```{r}
res.dist <- dist(ches_cluster, method = "euclidean")
res.hc <- hclust(d = res.dist, method = "ward.D2")
fviz_dend(res.hc, cex = 0.5)
```

```{r}
# Cut tree into 3 groups
grp <- cutree(res.hc, k = 3)

fviz_dend(
  res.hc, 
  k = 3, # Cut in four groups
  cex = 0.5, # label size
  k_colors = c("#2E9FDF", "#00AFBB", "#E7B800"),
  color_labels_by_k = TRUE, # color labels by groups
  rect = TRUE # Add rectangle around groups
)
```

```{r, fig.height=10, fig.width=10}
fviz_dend(
  res.hc, 
  cex = 1, 
  k = 3,
  k_colors = "jco", 
  type = "circular"
)
```

```{r}
require("igraph")
ggrep <- fviz_dend(res.hc, k = 3, k_colors = "jco",
          type = "phylogenic", repel = TRUE)
ggrep
```

```{r}
fviz_dend(res.hc, k = 3, # Cut in four groups
          k_colors = "jco",
          type = "phylogenic", 
          repel = TRUE,
          phylo_layout = "layout_with_drl")
```


```{r}
fviz_dend(res.hc, k = 3, # Cut in four groups
          k_colors = "jco",
          type = "phylogenic", 
          repel = TRUE,
          phylo_layout = "layout_as_tree")
```


```{r}
fviz_dend(res.hc, k = 3, # Cut in four groups
          k_colors = "jco",
          type = "phylogenic", 
          repel = TRUE,
          phylo_layout = "layout.gem")
```


```{r}
fviz_dend(res.hc, k = 3, # Cut in four groups
          k_colors = "jco",
          type = "phylogenic", 
          repel = TRUE,
          phylo_layout = "layout.mds")
```


```{r}
gg10 <- fviz_dend(res.hc, k = 3, # Cut in four groups
          k_colors = "jco",
          type = "phylogenic", 
          repel = TRUE,
          phylo_layout = "layout_with_lgl")
gg10
```


## Compare clustering algorithms in R

```{r}
library(clValid)
# Iris data set:
# - Remove Species column and scale df <- scale(iris[, -5])
# Compute clValid
clmethods <- c("hierarchical","kmeans","pam") 
intern <- clValid(
  ches_cluster %>% as.matrix, 
  nClust = 2:8,
  clMethods = clmethods, 
  validation = "internal"
) 
summary(intern)
```

```{r, eval = F}
# Stability measures
clmethods <- c("hierarchical","kmeans","pam")
stab <- clValid(
  ches_cluster %>% as.matrix,
  nClust = 2:6, 
  clMethods = clmethods,
  validation = "stability"
) # Display only optimal Scores
optimalScores(stab)
```


## Model-Based Clustering

The model parameters can be estimated using the Expectation-Maximization (EM) algorithm initialized by hierarchical model-based clustering. Each cluster k is centered at the means μk, with increased density for points near the mean.


```{r}
library(mclust)
mc <- Mclust(ches_cluster) # Model-based-clustering 
summary(mc)
```


```{r}
# BIC values used for choosing the number of clusters 
fviz_mclust(mc, "BIC", palette = "jco")
# Classification: plot showing the clustering 
fviz_mclust(mc, "classification", geom = "point",
pointsize = 1.5, palette = "jco") # Classification uncertainty
fviz_mclust(mc, "uncertainty", palette = "jco")
```


```{r}
ches %>% 
  ggplot(aes(liberalism, populism, colour = mc$classification)) + 
  geom_point() +
  #geom_smooth(method = "lm", formula = y ~ poly(x, 2))+
  #geom_text_repel(aes(liberalism, populism, label = party_cntry)) +
  ggthemes::theme_hc() +
  viridis::scale_color_viridis() + 
  geom_density2d(alpha = .7, color = "gray") # Add 2D density 
```



```{r, eval = F}
library(highcharter)

df1 <- tibble(vote = paste(ches_cluster_data$party_name, ches_cluster_data$vote_id, sep = " "), cluster = k3$cluster, x = as.vector(ches_cluster$liberalism), y = as.vector(ches_cluster$populism2)) %>%
  filter(stringr::str_detect(vote, "DE_"))
hchart(df1, hcaes(x = x, y = y, name = vote, color = cluster), type = 'scatter') %>%
  hc_add_theme(hc_theme_smpl()) %>%
  hc_tooltip(
    formatter = JS("function(){
                    return ('Party: <strong>' + this.point.vote + '</strong><br> X: ' + this.x + ' <br> Y: ' + this.y + ' <br>')
                  }")) %>%
  hc_chart(zoomType = "xy")
```

## World Map

```{r}
library(ggplot2)
world <- map_data("world")
world$iso3 <- countrycode::countrycode(world$region, "country.name", "iso3c")

ches <- ches %>%
  mutate(country = stringr::str_replace(vote_id, "_.*?$", "")) %>%
  mutate(iso3 = countrycode::countrycode(country, "iso2c", "iso3c"))
world$value <- ifelse(world$iso3 %in% unique(ches$iso3), "yes", "no")
# table(world$value)
# world %>% 
#   ggplot(aes(long, lat, group = group)) + 
#     geom_polygon(fill='grey')

ggmap <- world %>% 
  ggplot(aes(long, lat, group = group, fill = value)) + 
  geom_polygon() +
  #xlim(-20,50) + 
  #ylim(30,80) +
  scale_fill_manual("selected", values = c("gray90", "blue")) +
  theme_map()
ggmap
```



```{r, eval = F}
#ess_clean <- ess_sub  %>% 
  # mutate(eu_member =
  #          recode_factor(cntry,
  #               DE = 1958, BE = 1958, FR = 1958, NL = 1958, IE = 1973,
  #               GB = 1973, FI = 1995, AT = 1995, SE = 1995, EE = 2004,
  #               PL = 2004, SI = 2004, CZ = 2004, CH = 0, IL = 0,
  #               IS = 0, NO = 0, RU = 0
  #             )
  #       ) %>%
  # mutate(post_com = ifelse(region %in% c("Estonia", "Poland", "Slovenia", "Czech Republic", "Russian Federation"), "Post C", "West"))
```



## Get Info

* horse shoe theory
* Set up Rmarkdown paper template
* Set up Project page


```{r, eval = F}
p5 <- step5 %>%
  select(gndr, edu, income, rel, year) %>%
  gather("var", "value") %>%
  ggplot(aes(value, fill = var)) +
  geom_bar() +
  facet_wrap(~var, scales = "free") +
  viridis::scale_fill_viridis(discrete = T)
p5
```





